/Engine/Plugins/Experimental/ChaosVD/Source/ChaosVD/Public/ChaosVDPlaybackController.h
Gets the number of available steps in a track at the specified frame
Number of available steps
int32 GetTrackStepsNumberAtFrame ( [EChaosVDTrackType](API\Plugins\ChaosVD\EChaosVDTrackType) TrackType, int32 InTrackID, int32 FrameNumber ) const